CN223247859U

CN223247859U - Backrest support assembly and seat

Info

Publication number: CN223247859U
Application number: CN202422743165.XU
Authority: CN
Inventors: 王振旭
Original assignee: Qingxian Intelligent Innovation Shenzhen Co ltd
Current assignee: Qingxian Intelligent Innovation Shenzhen Co ltd
Priority date: 2024-11-08
Filing date: 2024-11-08
Publication date: 2025-08-22
Anticipated expiration: 2034-11-08

Abstract

The utility model discloses a backrest support assembly, which is used for a seat, and comprises a backrest support, a limiting piece and a resetting piece, wherein the backrest support comprises a backrest support part and a base connecting part, the backrest support part is used for supporting a backrest of the seat, the base connecting part can be rotatably connected with a base of the seat, the limiting piece comprises a first part and a second part which can stretch relative to the first part, one of the first part and the second part is used for connecting one of the backrest support and the base of the seat, the other of the first part and the second part is in sliding fit with the other of the backrest support and the base of the seat, and the resetting piece is used for being arranged on the base of the seat and can apply a force to the backrest support to reset the backrest support. The backrest support assembly is used for the seat, and is beneficial to improving the convenience of adjusting the backrest angle when a user uses the seat. In addition, the utility model also discloses a seat.

Description

Backrest support assembly and seat

Technical Field

The utility model relates to the technical field of seats, in particular to a backrest support assembly and a seat.

Background

In places such as offices, study rooms and the like, the seat is generally visible, and can meet the requirements of people on sitting, working, studying or resting for a long time.

In the related art seat, a backrest is supported by a backrest bracket rotatably connected with a base and is provided with an adjusting component, a clamping block in the adjusting component is fixed on a rotating shaft of the backrest bracket, a limiting step block is connected with the base, and the clamping block is propped against different steps of the limiting step block to limit the reclining angle of the backrest bracket relative to the base.

If the user wants to adjust the angle and/or position of the backrest relative to the base, the user needs to control the adjusting assembly to unlock so as to release the backrest bracket, and the backrest bracket can drive the backrest to rotate, so that the operation is troublesome and the use is inconvenient.

Disclosure of utility model

The main object of the present utility model is to propose a back support assembly aimed at improving the convenience of adjusting the angle and/or position of the back with respect to the base when the user uses the seat.

To achieve the above object, the present utility model provides a back support assembly for a seat, wherein the back support assembly comprises:

The backrest bracket comprises a backrest supporting part and a base connecting part, wherein the backrest supporting part is used for supporting a backrest of the seat, and the base connecting part can be rotationally connected with a base of the seat;

A stop comprising a first portion and a second portion that is retractable relative to the first portion, one of the first portion and the second portion being for connecting one of the back rest bracket and the seat base, the other of the first portion and the second portion being in sliding engagement with the other of the back rest bracket and the seat base;

The reset piece is used for being arranged on the base of the seat, and the reset piece can apply acting force to the backrest bracket to reset the backrest bracket.

In some embodiments, the back support is provided with a slide groove which forms a sliding fit with the second part when the second part is in sliding fit with the back support, or

The seat base is provided with a chute that forms a sliding fit with the second portion when the second portion is in sliding fit with the seat base.

In some embodiments, the second portion is configured with a sliding portion disposed in and slidable along the chute.

In some embodiments, the sliding part is a sliding shaft which is accommodated in the sliding groove, or

The sliding part is a pulley, and the pulley is accommodated in the chute.

In some embodiments, the stop is a gas spring, the first portion is a cylinder of the gas spring, and the second portion is a piston rod of the gas spring.

In some embodiments, the piston rod of the gas spring extends from one end of the cylinder, the other end of the cylinder is hinged with the base of the seat, the extending end of the piston rod of the gas spring is in sliding fit with the backrest bracket, or

The piston rod of the gas spring stretches out and draws back from one end of the cylinder body, the other end of the cylinder body is hinged with the backrest bracket, and the extending end of the piston rod of the gas spring is in sliding fit with the base of the seat.

In some embodiments, a switch is connected to the extending end of the piston rod of the gas spring, and the switch is used for locking or unlocking the piston rod of the gas spring.

In some embodiments, a rotating member is mounted to an end of the base connecting portion remote from the backrest support, and the base connecting portion is rotatably connected to the base of the seat by the rotating member.

In some embodiments, the swivel member includes a bracket connection portion detachably connected to the back bracket and a base hinge portion integrally formed with the bracket connection portion, the base hinge portion being configured to hinge with a base of the seat.

In some embodiments, the return member is a return spring, one end of which acts on the base hinge, and the other end of which is connectable with the base of the seat.

The utility model also provides a seat, which comprises a base, a backrest and the backrest support assembly, wherein the backrest support part supports the backrest, and the base connecting part is rotatably connected with the base.

The backrest support assembly is used for a seat, a user can lean against the backrest to different angles when using the seat, and the limit position of the backrest support in a backward rotation mode can be limited through the limiting piece so as to limit the backward rotation limit angle, wherein the backrest support is not completely locked due to the fact that the first part or the second part of the limiting piece is in sliding fit with the backrest support or the base of the seat, if the user wants to adjust the angle and/or the position of the backrest relative to the base, the user only needs to apply no backward rotation force to the backrest or reduce the backward rotation force applied to the backrest, the backrest support can slide relative to the limiting piece connected with the base or the limiting piece connected with the backrest support can slide relative to the base under the acting force applied to the backrest support by the resetting piece, and therefore the backrest support can directly drive the backrest to rotate, the backrest is automatically adapted to the back position of the user, the backrest is not needed to be unlocked by operating the limiting piece, and the backrest support is simple to operate and convenient to use. In addition, the backrest can be used for timely chasing the back, and the convenience of adjusting the angle of the backrest when a user uses the seat is improved.

Drawings

FIG. 1 is a schematic view of a backrest support assembly supporting a backrest of a seat and connected to a base of the seat in accordance with an embodiment of the present utility model;

FIG. 2 is a schematic view of a backrest support assembly coupled to a seat base in accordance with an embodiment of the present utility model;

FIG. 3 is a schematic view of a portion of a back support assembly according to an embodiment of the present utility model;

FIG. 4 is a schematic view of a retainer of a back support assembly according to an embodiment of the present utility model;

FIG. 5 is a schematic view of a portion of a back support assembly according to an embodiment of the present utility model;

fig. 6 is a schematic structural view of a further portion of a back support assembly according to an embodiment of the present utility model.

Detailed Description

The following description of the embodiments of the present utility model will be made more clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that all directional indicators (such as up, down, left, right, front, and rear are used in the embodiments of the present utility model) are merely for explaining the relative positional relationship, movement conditions, and the like between the components in a certain specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicators are changed accordingly.

It will also be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.

Furthermore, the description of "first," "second," etc. in this disclosure is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.

The seat is used as a seat for people to sit when working, learning or resting, and the technology of the seat is developing towards more humanization and more intellectualization, so as to provide comfortable and healthy sitting posture experience for users.

Generally, a seat mainly comprises a base, a cushion, a backrest and other structures, and the base (also called a chassis) is used as a basis of the whole seat structure, bears the weight of a human body and various pressures possibly generated in the use process, and has enough strength and stability. In addition, the base is a key component for connecting the seat main body (such as a backrest, a cushion and the like), and the components are combined together through a specific connection mode (such as fixed connection, rotary connection and the like) to form a complete seat structure. Wherein, the cushion is located on the base, and the top of cushion and the rear side that is located the cushion are located to the back, and when the human body was sat in the seat, correspond to sit to the cushion on, the cushion corresponds to provide the support for human buttock and thigh. Also, the back and/or waist may rest against a backrest, which in turn provides support for the back and/or waist of the person.

The embodiment of the utility model provides a backrest support assembly which is used as a support structure for supporting a backrest and is used for a seat. In a seat, the backrest may be coupled to the backrest support assembly to provide a mounting arrangement.

Referring to fig. 1 and 2, the back support assembly 100 includes:

The backrest bracket 110 includes a backrest support 111 and a base connection 112, the backrest support 111 is used for supporting the backrest 200 of the seat, and the base connection 112 is rotatably connected with the base 300 of the seat;

A stopper 120 including a first portion 121 and a second portion 122 that is retractable with respect to the first portion 121, one of the first portion 121 and the second portion 122 being for connecting one of the back rest bracket 110 and the seat base 300, the other of the first portion 121 and the second portion 122 being in sliding engagement with the other of the back rest bracket 110 and the seat base 300;

the restoring member 130 is configured to be disposed on the base 300 of the seat, and the restoring member 130 can apply a force to the backrest frame 110 to restore the backrest frame.

Wherein the back support 110 may be disposed at a rear side of the base 300 for cooperating with the back support 200 to provide support to the back and/or waist of the human body. The shape of the back bracket 110 may be various, such as arc, S-shape, L-shape, etc., and may be set according to actual structural requirements. To ensure sufficient support strength, the back bracket 110 may be made of metal (e.g., steel, aluminum alloy, etc.), plastic, etc. The back bracket 110 is connected to the back 200 of the seat and forms a support for the back 200, for example, the back is located in the front side direction of the back bracket 110 and connected to the back bracket 110 with the front-rear left-right direction of the seat as a reference direction. The backrest bracket 110 mainly comprises a backrest supporting part 111 and a base connecting part 112, wherein the backrest supporting part 111 and the base connecting part 112 form an included angle, and the included angle can be a right angle or an obtuse angle. The backrest support 111 and the base connection 112 may be integrally formed or detachably connected. The back bracket 110 forms a support for the back 200 by its back support portion 111 and is rotatably connected to the seat base 300 by the base connection portion 112. The structure of the rotational connection between the backrest bracket 110 and the base 300 may be that the base connection portion 112 of the backrest bracket 110 is inserted into the base 300 through the hinge shaft Jz to be rotatably connected with the base 300. Of course, this is merely exemplary and is not limiting.

The limiting member 120 is disposed between the backrest bracket 110 and the base 300, and is capable of limiting the rotational position of the backrest bracket 110, thereby limiting the limit angle of recline. The limiting member 120 mainly comprises a first portion 121 and a second portion 122, wherein the second portion 122 and the first portion 121 are in a movable or fixed structural relationship, in other words, the limiting member 120 has a locking function, in a locked state, the second portion 122 is fixed relative to the first portion 121, and in an unlocked state, the second portion 122 can stretch relative to the first portion 121. Optionally, the first portion 121 and the second portion 122 are both substantially rod-shaped, the first portion 121 is a first rod portion, the second portion 122 is a second rod portion, the second rod portion is coaxially disposed with the first rod portion, and the second rod portion is partially disposed in the first rod portion, partially extends out of the first rod portion, and is retractable with respect to the first rod portion. The limiting member 120 may be of various types, for example, the limiting member 120 may be a gas spring, an electric push rod, or the like.

The connection/mating relationship between the stopper 120 and the back bracket 110, the base 300 may include:

The first portion 121 of the stopper 120 is connected to the back bracket 110 and the second portion 122 is slidably engaged with the base 300, or

The second portion 122 of the stopper 120 is coupled to the back bracket 110, the first portion 121 is slidably engaged with the base 300, or

The first portion 121 of the stopper 120 is connected to the base 300 and the second portion 122 is slidably engaged with the back bracket 110, or

The second portion 122 of the limiting member 120 is connected to the base 300, and the first portion 121 is slidably engaged with the backrest bracket 110.

The above four connection/mating relationships may be one of them in practical application, and this embodiment is not limited thereto. The connection may be a hinge connection, a rotational connection, or the like, so that the limiting member 120 may follow the rotational movement of the backrest bracket 110 to rotate within a certain range, thereby avoiding movement interference. The sliding fit refers to a fit relationship in which two parts have relative sliding motion, and a corresponding sliding fit structure may be a chute, a slide rail, or the like, in which one part may slide smoothly on the other part to achieve a specific function.

Optionally, the first portion 121 or the second portion 122 of the limiter 120 is connected or slidably engaged with the base connecting portion 112 to achieve a connection or sliding engagement with the back support 110.

The return member 130 functions to provide a force to the back bracket 110 such that the back bracket 110 can be pivoted back toward the initial position after rotation. For example, after the backrest bracket 110 is rotated and reclined, when the external force is removed or reduced, the backrest bracket 110 can be rotated and reset from the reclined position toward the sitting position by the reset member 130. The restoring member 130 may be an elastic member, and the backrest bracket 110 may be restored under the elastic force of the elastic member. For example, the reset member 130 is a reset coil spring, which is sleeved on the hinge shaft Jz of the back bracket 110 and connected to the back bracket 110, including but not limited to. In addition, the number of the reset members 130 may be set according to practical requirements, which is not limited in this embodiment.

In the present embodiment, the limiting member 120 is disposed between the backrest bracket 110 and the base 300, the limiting member 120 is respectively connected or matched with the backrest bracket 110 and the base 300, and the limiting position of the backrest bracket 110 is controlled by controlling the length of the limiting member 120 (the second portion 122 of the limiting member 120 stretches and contracts relative to the first portion 121 to adjust the length), so as to limit the limiting back elevation angle of the backrest 200. Wherein, since the limiting member 120 is slidably engaged with one of the backrest bracket 110 and the base 300, the limiting member 120 does not lock the backrest 200, but only limits the limited back elevation angle of the backrest 200, and the backrest 200 can rebound normally (the force of rebound of the backrest 200 is provided by the reset member 130).

The backrest support assembly 100 is used for a seat, a user can lean back against the backrest 200 to different angles when using the seat, and can limit the back-turning limit position of the backrest support 110 through the limiting piece 120 so as to limit the back-turning limit angle, wherein the first part 121 or the second part 122 of the limiting piece 120 is in sliding fit with the backrest support 110 or the base 300 of the seat, the backrest support 110 is not completely locked, the backrest 200 is correspondingly not directly locked, if the user wants to adjust the angle and/or the position of the backrest 200 relative to the base 300, the user only needs to apply no back-turning force to the backrest 200 or reduce the back-turning force applied to the backrest 200, under the action force applied to the backrest support 110 by the resetting piece 130, the backrest support 110 can slide relative to the limiting piece 120 connected with the base 300, or the limiting piece 120 connected with the backrest support 110 can slide relative to the base 300, so that the backrest support 110 can directly drive the backrest 200 to rotate, the backrest 200 does not need to be automatically adapted to the back position of the user, the operation of the limiting piece 120 is easy to operate, and the backrest 200 can be conveniently used, and the user can conveniently adjust the angle of the backrest 200 in time.

In some embodiments, referring to FIGS. 2 and 3, the back bracket 110 is provided with a slide channel C that forms a sliding fit with the second portion 122 when the second portion 122 is slidably engaged with the back bracket 110, or

The seat base 300 is provided with a slide channel C that forms a sliding fit with the second portion 122 when the second portion 122 is in sliding engagement with the seat base 300.

When the second portion 122 is slidably engaged with the backrest bracket 110 or the seat base 300, the backrest bracket 110 and the seat base 300 are both in a sliding engagement with the second portion 122 by adopting a sliding groove C, and the sliding groove C may be substantially extended along the front-rear direction of the seat, and the sliding groove C may be a linear sliding groove or an arc sliding groove, and may be set according to practical requirements.

The second portion 122 may be slidably engaged with the sliding groove C through an end of the second portion 122 facing away from the first portion 121, and when the back bracket 110 swings from the reclined position toward the sitting position, the end of the second portion 122 facing away from the first portion 121 slides along the sliding groove C.

In some embodiments, the second portion 122 is configured with a sliding portion that is disposed in and slidable along the chute C. Specifically, the sliding portion configured on the second portion 122 is adapted to the sliding groove C, and the sliding portion is correspondingly disposed in the sliding groove C to form a sliding fit with the sliding groove C. The number of the sliding grooves C may be one, or may be more than one, such as two or three. When the sliding groove C is provided with more than one, two sliding grooves C may be provided, and the two sliding grooves C may be disposed opposite to each other in the left-right direction of the seat, and the sliding portions may be respectively accommodated in the two sliding grooves C and may slide along the two sliding grooves C.

The sliding portion may take various forms, for example:

In some embodiments, referring to fig. 4, the sliding portion is a sliding shaft Z, and the sliding shaft Z is accommodated in the chute C. The sliding part adopts a sliding shaft Z, the sliding shaft Z is tightly matched with the sliding groove C, the smoothness of relative movement can be ensured, the friction and the abrasion are reduced, in addition, the sliding shaft Z is matched with the sliding groove C, the structure is simple, the disassembly and the assembly are easy, and the maintenance and the replacement are convenient. When the sliding grooves C are provided with one sliding groove, one end of the sliding shaft Z is accommodated in the sliding groove C and forms sliding fit with the sliding groove C, and when the sliding grooves C are provided with two sliding grooves, as shown in fig. 2 to 4, one end of the sliding shaft Z can be accommodated in one of the two sliding grooves C and forms sliding fit with the sliding groove C, and the other end of the sliding shaft Z is accommodated in the other of the two sliding grooves C and forms sliding fit with the sliding groove C.

Or in some embodiments, the sliding portion is a pulley, and the pulley is accommodated in the chute C. The sliding part adopts the pulley, and when the pulley slides relative to the chute C, the pulley also rolls in the chute C, so that the friction force in the motion process can be greatly reduced, the sliding smoothness is improved, and the jamming condition is avoided. When the sliding grooves C are arranged in two, one side of the pulley can be accommodated in one of the two sliding grooves C and form sliding fit with the other sliding groove, and when the sliding grooves C are arranged in two, the other side of the pulley can be accommodated in the other sliding groove C and form sliding fit with the other sliding groove.

In some embodiments, referring to fig. 2 and 4, the limiter 120 is a gas spring, the first portion 121 is a cylinder of the gas spring, and the second portion 122 is a piston rod of the gas spring. In this embodiment, the limiting member 120 is a gas spring, and the first portion 121 and the second portion 122 of the limiting member 120 are respectively a cylinder and a piston rod of the gas spring.

In the gas spring, the cylinder body is used as a main body part, the inside is filled with high-pressure gas, one end of the piston rod is connected in the cylinder body, and the other end of the piston rod extends out of the cylinder body and is used for bearing external load. The gas spring is to charge inert gas or oil-gas mixture into a closed cylinder body to make the pressure in the cylinder body higher than the atmospheric pressure by several times or tens times, and to realize the movement of the piston rod by utilizing the pressure difference generated by the fact that the cross section area of the piston rod is smaller than that of the piston. When the external force acts on the piston rod, the gas in the cylinder body is compressed to generate elastic force to play roles in supporting, buffering and the like, and when the external force acts on the piston rod disappears, the gas in the cylinder body expands to push the piston rod to reset.

The cylinder has opposite ends, one end of the cylinder is provided with a piston rod which stretches out, the piston rod stretches out and stretches back from the end of the cylinder, and the other end of the cylinder can be connected with or matched with an external structure/member. The end of the piston rod extending out of the cylinder is an extending end, which can be connected or matched with an external structure/member.

When the first portion 121 of the limiting member 120 is connected to the base 300 of the seat and the second portion 122 is slidably engaged with the backrest bracket 110, the structural arrangement of the air spring based on the limiting member 120 may be that in some embodiments, the piston rod of the air spring stretches from one end of the cylinder, the other end of the cylinder is hinged to the base 300 of the seat, and the extending end of the piston rod of the air spring is slidably engaged with the backrest bracket 110. In combination with the previous embodiments, the protruding end of the piston rod of the gas spring is optionally configured with a sliding portion, wherein the sliding portion may be a sliding shaft Z or a pulley.

When the first portion 121 of the limiting member 120 is connected to the backrest bracket 110 and the second portion 122 is slidably engaged with the seat base 300, the limiting member 120 is based on a gas spring structure, which may be that, in some embodiments, a piston rod of the gas spring stretches from one end of a cylinder, the other end of the cylinder is hinged to the backrest bracket 110, and an extending end of the piston rod of the gas spring is slidably engaged with the seat base 300. In combination with the previous embodiments, the protruding end of the piston rod of the gas spring is optionally configured with a sliding portion, wherein the sliding portion may be a sliding shaft Z or a pulley.

In some embodiments, referring to fig. 2 and 4, a switch G is connected to the extended end of the piston rod of the gas spring, and the switch G is used to lock or unlock the piston rod of the gas spring. When the switch G is opened, the piston rod of the corresponding unlocking gas spring is switched to a movable state and can stretch and retract relative to the cylinder body, and when the switch G is closed, the piston rod of the corresponding locking gas spring is switched to a fixed state and cannot stretch and retract relative to the cylinder body. The user can realize the locking or unlocking of the telescopic function of the piston rod of the gas spring by controlling the switch G, so that the extension length of the piston rod can be changed, the length of the gas spring can be adjusted, and the locking of the backward elevation angle can be realized.

The switch G may be a wire-controlled switch connected to a pull wire, for example, and unlocks a piston rod of the gas spring when the wire-controlled switch is pulled by the pull wire, and locks the piston rod of the gas spring when the wire-controlled switch is released. This is exemplary only and not limiting, and other types of switches may be used instead.

The working principle can be as follows:

When the seat is in the sitting position, the gas spring is in the longest state, and when a person applies a reclining force to the backrest 200 to enable the backrest bracket 110 to rotate backwards, the gas spring is compressed at the moment by pulling the wire control switch, the wire control switch is released, the length of the gas spring is locked, and when the person no longer applies a reclining force to the backrest, one end of the gas spring is positioned in the sliding groove C and is a free end (not fixedly connected), and the backrest bracket 110 automatically returns towards the initial position by virtue of the acting force of the reset piece 130. In addition, if the user pulls the wire control switch at this time, the gas spring can automatically restore the original length, and can apply additional force to the backrest bracket 110 to assist the backrest bracket to return to the original position.

The limiting member 120 is disposed between the base connecting portion 112 and the base 300 of the seat, and its specific disposition includes various positions.

Referring to fig. 5, one of them may be that the stopper 120 is located at the rear lower side of the rotation axis X of the back bracket 110. Specifically, with the front-rear direction of the seat as the reference direction, the stopper 120 is disposed rearward of the rotation axis X of the back bracket 110 and at a position below the rotation axis X of the back bracket 110. The check member 120 is in the longest state when the seat is in the sitting position, and the check member 120 is compressed to be shortened when a person applies a reclining force to the backrest 200 to rotate the backrest bracket 110 rearward. By disposing the stopper 120 at the rear lower side of the rotation axis of the back bracket 110, the stopper 120 is less likely to interfere with other members (such as the back 200, etc.).

Referring to fig. 5, the second position limiter 120 may be located at the upper front side of the rotation axis X of the back bracket 110. Specifically, with the front-rear direction of the seat as the reference direction, the stopper 120 is disposed forward of the rotation axis X of the back bracket 110 and at a position above the rotation axis X of the back bracket 110. The check member 120 is in the shortest state when the seat is in the sitting position, and the check member 120 is extended when a person applies a reclining force to the backrest 200 to rotate the backrest bracket 110 rearward.

In some embodiments, referring to fig. 2, a rotation member 140 is mounted to an end of the base connection part 112 remote from the backrest support part 111, and the base connection part 112 is rotatably connected to the base 300 of the seat through the rotation member 140. The rotating member 140 may take a form of a rotating frame, a rotating seat, or the like, and the rotating member 140 may penetrate through the hinge shaft Jz and be hinged to the base 300 of the seat through the hinge shaft Jz, so as to form a rotatable connection relationship. The base connection 112 may be connected to the swivel member 140 to thereby be rotatably connected to the base 300 of the seat. Specifically, the rotating member 140 rotates relative to the seat base 300, and further drives the backrest bracket 110 to rotate relative to the seat base 300. Alternatively, the backrest bracket 110 may be rotated by the rotating member 140 on the base 300 of the seat.

Wherein, the base connection portion 112 and the rotating member 140 may be detachably connected, and the detachable connection may include a screw connection, a snap connection, or the like. Thus, in daily use, if the backrest bracket 110 needs to be overhauled, the backrest bracket 110 is only required to be detached from the rotating member 140, so that the operation is simple and the use is convenient.

In some embodiments, referring to fig. 2 and 6, the rotating member 140 includes a bracket connection portion 141 and a base hinge portion 142 integrally formed with the bracket connection portion 141, the bracket connection portion 141 being detachably connected to the back bracket 110, the base hinge portion 142 being configured to hinge with the base 300 of the seat. The rotating member 140 includes a bracket connecting portion 141 and a base hinge portion 142, where the bracket connecting portion 141 and the base connecting portion 112 are integrally formed, so that the overall structural strength of the rotating member 140 can be ensured, and the structural stability is good. The rotating member 140 is detachably connected to the back bracket 110 through the bracket connection portion 141, and the detachable connection may be in the form of a screw connection, a snap connection, or the like. The rotator 140 is hinged to the seat base 300 by a base hinge 142. Alternatively, two base hinge parts 142 may be provided, and the two base hinge parts 142 are disposed opposite to each other in the left-right direction of the seat and are hinged to the base 300 through hinge shafts Jz, respectively.

In some embodiments, referring to fig. 2 and 6, the return 130 is a return spring, one end of which acts on the base hinge 142 and the other end of which is connectable with the seat base 300. The reset piece 130 adopts a reset spring, and the backrest bracket 110 is enabled to rotate and reset through the elastic force of the reset spring, so that the structure is simple and reliable, the arrangement is easy, and the service life is long. When the reset springs are arranged with more than one, the reset springs are orderly arranged at intervals along the left and right directions of the seat, the spacing between any two adjacent reset springs is kept equal, and stable elastic force can be provided for the backrest bracket 110, so that the backrest bracket 110 can stably rotate during resetting.

The working principle of the return spring may be that when the backrest bracket 110 is rotated backward by an external force, the base hinge portion 142 presses the return spring to compress and deform the return spring, and when the backrest bracket 110 is retracted by the external force, the return spring stretches and deforms to drive the base hinge portion 142 to move, so that the rotating member 140 drives the backrest bracket 110 to rotate and return.

The embodiment of the present utility model also proposes a seat comprising a base 300, a backrest 200 and a backrest support assembly 100 as described in the previous embodiments, a backrest support 111 supporting the backrest 200, and a base connection 112 rotatably connected to the base 300. The specific structure of the backrest support assembly 100 refers to the above embodiments, and since the present seat adopts all the technical solutions of all the embodiments, at least all the technical effects brought by the technical solutions of the embodiments are provided, and will not be described in detail herein.

The above description of the preferred embodiments of the present utility model should not be taken as limiting the scope of the utility model, but rather should be understood to cover all modifications, variations and adaptations of the present utility model using its general principles and the following detailed description and the accompanying drawings, or the direct/indirect application of the present utility model to other relevant arts and technologies.

Claims

1. A back support assembly for a seat, the back support assembly comprising:

2. The back support assembly of claim 1, wherein said back support is provided with a slide groove forming a sliding fit with said second portion when said second portion is slidingly engaged with said back support, or

3. The back support assembly of claim 2, wherein the second portion is configured with a slide portion disposed in and slidable along the chute.

4. The back support assembly of claim 3, wherein the support member comprises a support member,

The sliding part is a sliding shaft which is accommodated in the sliding groove or

The sliding part is a pulley, and the pulley is accommodated in the chute.

5. The back support assembly of claim 1, wherein the support member comprises a support member,

The limiting piece is a gas spring, the first part is a cylinder body of the gas spring, and the second part is a piston rod of the gas spring.

6. The back support assembly of claim 5, wherein the support member comprises a support member,

The piston rod of the gas spring stretches from one end of the cylinder body, the other end of the cylinder body is hinged with the base of the seat, and the extending end of the piston rod of the gas spring is in sliding fit with the backrest bracket, or

7. The back support assembly of claim 5, wherein the support member comprises a support member,

The extension end of the piston rod of the gas spring is connected with a switch, and the switch is used for locking or unlocking the piston rod of the gas spring.

8. The back support assembly of claim 1, wherein a swivel is mounted to an end of the base connection portion remote from the back support portion, the base connection portion being rotatably connected to the base of the seat by the swivel.

9. The back support assembly of claim 8, wherein the swivel member comprises a bracket connection portion and a base hinge portion integrally formed with the bracket connection portion, the bracket connection portion being detachably connected to the back support, the base hinge portion being configured to hinge with a base of the seat.

10. The back support assembly of claim 9, wherein the support member comprises a support member,

The reset piece is a reset spring, one end of the reset spring acts on the base hinge part, and the other end of the reset spring can be connected with the base of the seat.

11. A seat comprising a base, a backrest and a backrest support assembly as claimed in any one of claims 1 to 10, the backrest support supporting the backrest, the base connection being rotatably connected to the base.